Planimeter.



B. M00. SGOVILLE. PLANIMBTBR.

-AP1LIOATION FILED FEB. 16. 1906.

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Specification of Letters Patent.

Patented Feb. 12, 1907.

Application filed February 16. 1906. Serial No. 301,371.

To a, whom it may concern:

Be it known that I, EUGENE MoOLELLAN SOOVILLE, a citizen of the United States, and. resident of VVaipahu, Oahu, Hawaii, have invented a new and Improved Planimeter, of which the following is a full, clear, and exact description.

My invention relates to a planimeter adapted to perform the usual functions of instruments of this character.

The principal objects of the invention are to decrease the expense of construction and the number of parts of instruments of this character, to provide for additional smoothness, and to provide means for supporting a number of scales in a convenient position in such a manner that it will not be necessary to replace the scales in operation.

Other features of the invention will appear below.

Reference is to be had to the accompanying drawings, forming a part of this specificati on, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan of a planimeter constructed in accordance with the principles of my invention. Fig. 2 is a plan view of the same, partly in section. Fig. 3 is a sectional view on the line 3 3 of Fig. 2. Fig. 4 is a sectional view on the line 4 4 of Fig. 3. Fig. 5 is a sectional view on the line 5 5 of Fig. 2, and Fig. 6 is a sectional view on the line 6 6 of Fig. 5.

My present invention belongs to that type of planimeters in which a track 10 is employed for guiding a certain part of the device. I have shown this track as being fixed to the base or table on which the instrument operates and. being provided with an end 11, extending over the surface of the base or table sufficiently near thereto to provide for holding an indicator-card 12in proper position for operation. The main reason for having the track project over the indicator-card is to allow for the operation of the device on a particularly short card and also to provide a convenient manner for holding the card. As will be readily observed, the card is held by being placed under the end 11 of the track, which is preferably provided with teeth or corrugations 13 for assisting in holding the cards.

The instrument itself comprises a frame I 1 1, which is provided with a swiveled member 15, having downwardly-projecting sides 16. Through these sides extend a pair of screws 18*, which obviously can be adjusted u hich are provided with points for entering caster is provided with a beveled groove 19 for running on the track 10, which 1s also dental displacement of the caster. The sides 16 terminate in points 17, extending below the lower surface of the caster and below the top of thejtrack. These are provided for the purpose of locating a line on the indicatorwhich'the instrument is originally set up. The frame 14 is provided with two pairs of I collars 18 which extend inwardly through hubs 19-on the frame. These collars arelocated onthe inner side of a pair of projections 20, with which the frame is provided. On the outside of these projections is a second pair of collars 21, which are threaded into the collar, projections and are. therefore ed to be located on the instrument, each scale. member being provided with two scales, one on each side. These scales are employed in the usual manner, and as the threads they can be turned so as to bring any desired one of the scales into proper position to read the mean effective pressure directly thereon. Through the frame at right angles to the shaft 23 extends a second shaft 29,

this shaft in any desired position on the frame.

In operation the card bearing the diagram is inserted under the clip 11, and the machine is set with the caster in such position that the points 17 are at one end of the-diato any desired distance from each other and depressions in the sides of a caster 18 This provided with beveled sides to prevent acci card and affording a guide as to the point at adjustablein such a manner as to provide for I consequently four scale members are adaptcollars 18 are i not provided with screwwhich is provided with'a tracing-point 30. A thumb-screw 31 is. provided for securing which the indicator-card is taken, and the instrument is placed on the track with the tracingrpoint at any suitable place on the dia gram. 'Ihe shaft 23 is then moved into a position such that the mark 25 thereon corresponds'to the zero-mark of the scale. The tracing-point is now passed over the outline of the diagram until it is returned to its starting-place, the tracing-wheel being carefully retained in contact with the base or table. The wheel rotates during lateral movement of the shaft, and the shaft moves through its bearing during lateral movement of the arm 29, and theposition of the mark 25 with reference to the scale at the comple tion of the movement of the tracing-point indicatesthe mean effective pressure of the engine when used on indicator-cards or the area of the surface inclosed by the tracing of the point. It will be understood that when merely the area is desired scales graduated in square measures would be used.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A planimeter comprising a frame, a shaft movable through the frame and provided with a tracing-wheel, and means on the frame for detachably supporting a plurality of scales longitudinally of the shaft and with their edges adjacent thereto and in spaced relation with respect to each other 2. In a planimeter, the combination with a frame, of a pair of rotatable collars thereon, a shaft movable through the collars and a plurality of scales held by said collars, said frame having bearings and the collars having bearing-surfaces adjacent to said bearings.

3. In a planimeter, the combination of a frame having a pair of projections provided with passages therethrough in alinement with each other, and a pair of collars, one on the inside of each of the said projections extending into the passages, said collars having slots for receiving scales between them.

4.. In a planimeter, the combination of a frame having a pair of projections provided with passages therethrough in alinement with each other, a pair of collars, one on the 1 inside of each of the said projections extending into the passages, said collars having slots for receiving scales between them, a pair of collars located on the outside of said projections, said lastnamed. collars having screwthreaded extensions located in said passages for permitting adjustment of the collars, a, shaft passing through the several collars and having a registering-mark, and ball-bearings located between the adjacent ends of the inside and outside collars. I

5. In a planimeter, the combination of frame having adjustable bearings, a shaft passing through said bearings, a knife-edged wheel secured to the shaft, an adjustable bar at right angles to said shaft, and a tracingpoint on the bar.

6. In a planimeter, the combination of a ,frame having adjustable bearings, a shaft passing through said bearings, a knife-edged wheel secured to the shaft, an adjustable bar at right angles to said shaft, a tracing-point on the bar, a'caster swiveled to the frame, and means for adjusting thecaster.

7. In a planimeter, the combination with a frame of a shaft mounted for rotation and longitudinal movement thereon, a knifeedged wheel thereon, a bar on the frame at right angles to said shaft and longitudinally movable, and a member swiveled to turn on an axis at right angles to the shaft and to the bar, said member having a pointer, and a caster rotatably mounted on said member and located with its axis in a vertical plane passing through the pointer.

8. A planimeter having a swiveled member, a pair of pointers extending downwardly therefrom, a pair of pointed screws adjustably mounted in said members, their points extending inwardly toward each other, and a caster having depressions for receiving said points and located between said pointers, the extremities of said pointers being below the bottom of the caster and vertically below the adjustable points.

9. In a planimeter, the combination with a frame of a shaft mounted for rotation and longitudinal movement thereon, a knifeedged wheel thereon, a bar on the frame at right angles to said shaft and longitudinally movable, a member swiveled to turn on an axis at right angles to the shaft and to the bar, said member having a pointer, and a caster rotatably mounted on said member and located with its axis in a vertical plane passing through the pointer, and a track on which the caster is adapted to run, said track having means for holding an indicator-card.

10. The combination of a planimeter having a swiveled caster, and a track upon which said caster is adapted to run, said track hav ing a clip for receiving and holding an indicator-card.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EUGENE lllGCIiEIiIiAN SCOVILLE.

Witnesses:

F. E. RICHARDSON, H. C. CARTER. 

